To steal someone else's unique style that sets them apart from the crowd, makes them famous, or otherwise steals their thunder making them warrant a lot less attention or swagger factor.

A good part popularized by celebs and hip hop songs like Black Eyed Peas - Boom Boom Pow. The female artists in the song sings, "Them Chickens jackin' my style. They try to copy my swagger. I'm on that next shit now."

A guy goes to a uppity club or a local trendy, upscale hang out spot with a few friends but dresses up in fancy black clothing to top the competition which earns him attention of beautiful women. He starts to notice more and more men doing the same looking and acting more like him. He realizes they are nothing but lame swagger jackers who have no real game of their own but to live off someone else's own success.

Like say i buy something first or do something first and you see me wearing what i brought or do what i did and you like it, then you turn right around and buy what i brought or do what i did thats what a swagger jacker is ya digz.

The Urban Dictionary T-Shirt

A copycat, biter, or plagairizer. One who rips off song lyrics from another, particularly rap/hip hop lyrics. Term popularized by Harlem rapper Cameron "Cam'ron" Giles in refrence to Brooklyn rapper Sean "Jay-Z" Carter and his penchant for using lyrics by Notorious B.I.G., Tupac, Slick Rick, Rakim, and others. See the song "Swagger Jacker" by Cam'ron for more info.

The Urban Dictionary T-Shirt

A person who doesn't know how to be themselves so they copy your style, hobbies, interests, etc. They try to sound and be just like you. They even go as far as taking your ideas and/or habits and claiming them as their own. They intently hang on to every word you say so that they can repeat the exact same thing next week. You will also find that they are very jealous of you as well. They hate the fact that they can not come up with unique views and opinions on their own like you do. Do not think it is strange when you have a nagging feeling that they are talking about you behind your back while smiling in your face. Saying hurtful and mean things about you helps to soothe the burning dissapointment of not being able to be YOU.

Karen is such a swagger jacker, as soon as she found out that my favorite color was orange, she ran out to buy everything in orange...LOSER!!!!